Use XDG config path on FreeBSD

doc/users/customizing.rst

@@ -140,8 +140,8 @@ locations, in the following order:
 
 3. It next looks in a user-specific place, depending on your platform:
 
-   - On Linux, it looks in :file:`.config/matplotlib/matplotlibrc` (or
-     `$XDG_CONFIG_HOME/matplotlib/matplotlibrc`) if you've customized
+   - On Linux and FreeBSD, it looks in :file:`.config/matplotlib/matplotlibrc`
+     (or `$XDG_CONFIG_HOME/matplotlib/matplotlibrc`) if you've customized
      your environment.
 
    - On other platforms, it looks in :file:`.matplotlib/matplotlibrc`.

lib/matplotlib/__init__.py

@@ -645,7 +645,7 @@ def _get_config_or_cache_dir(xdg_base):
     h = get_home()
     if h is not None:
         p = os.path.join(h, '.matplotlib')
-    if sys.platform.startswith('linux'):
+    if sys.platform.startswith('linux') or sys.platform.startswith('freebsd'):
         p = None
         if xdg_base is not None:
             p = os.path.join(xdg_base, 'matplotlib')